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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 37m 43s
Declination-57° 14' 12"
Distance139 light years
43 parsecs
MagnitudeApparent: +0.5
Absolute: -2.8
Spectral ClassB3V Blue Dwarf
Optimum VisibilityOctober / November (Usually visible from southern latitudes)
NotesAn eclipsing binary of the Beta Lyrae type, with a white companion star

A blue dwarf star with an unusual spectrum, Achernar has a magnitude of +0.5, making it the brightest of the stars of Eridanus, and the ninth brightest in the entire sky.

Location of Achernar

Bright Achernar lies at the extreme southern tip of the star-river Eridanus, less than a degree from its southernmost border with neighbouring Hydrus.

Achernar

The River's End: brilliant blue Achernar, the ninth brightest star in the sky, lies at the southern tip of the star-river Eridanus.

HR Diagram
π Cephei
Polis
75 Cygni
Pincoya
Nashira
Adhafera
Petra
ο1 Cygni
Absolutno
a Velorum
TZ Arietis
θ Hydrae
V2306 Ophiuchi
ζ Arae
x Carinae
w Carinae
Xi Boötis B
Sharjah
s Velorum A
41 Draconis
Struve 2398 B
Gliese 687
Bosona
Gakyid
Berehynia
b Velorum
Guniibuu
GX Andromedae
HD 37131
Nosaxa
Diya
Dombay
Chaophraya
e Aquilae
Ebla
Felixvarela
FL Virginis
Cerberus
ε Indi
Erakis
Kapteyn's Star
Koeia
LV Draconis
Kruger 60 A
La Superba
DO Cephei
Miram
AX Microscopii
AU Microscopii
HR 5546
Inquill
Mekbuda
χ Cygni
Wezen
Wolf 359
Wolf 498
Mirfak
δ Circini
Mira
ν2 Canis Majoris
δ Andromedae
Mebsuta
Alfirk
Alchiba
δ Caeli
Naos
Deneb
Ross 154
Almaaz
Ran
Polaris
β Pictoris
Suhail
Antares
Proxima Centauri
Sirius B
Sirius
σ Orionis
Hatysa
Arneb
β Doradus
Aspidiske
EE Leonis
Schedar
Rastaban
HO Librae
52 Orionis
Sadr
Atria
ρ Cygni
Avior
61 Cygni B
61 Cygni A
Rigel
α Centauri A
Gliese 536
WX Ursae Majoris
τ Ceti
15 Orionis
Acubens
Enif
Castor B
van Maanen's Star
Alnilam
Capella
Canopus
ε Reticuli
Achird
UV Ceti
14 Persei
η Carinae
Unurgunite
π5 Orionis
U Sagittarii
Tureis
ο Capricorni B
Azmidi
θ Circini
BF Orionis
Thabit
Betelgeuse
Teegarden's Star
ι1 Scorpii
γ Pavonis
Sargas
Achernar

Hertzprung-Russell diagram plotting the temperature and luminosity of Achernar (marked by the red circle) relative to other stars.

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